There is absolutely no reason to have 30k health in the game at this current stage
I would counter with "There's absolutely no reason not to."
Tanks in this game don't get hit very hard, so either gearing strategy works fine for current content. The advantage of stacking Endurance is that it provides a guaranteed increase to time-to-live when heals dry up. Defensive Stats only provide RNG protection in that regard, since you can still take a streak of unavoided and unshielded hits. Endurance is also better against Force/Tech bosses like Stormcaller.